摘要
针对直流微电网中多个储能单元在补充或吸收系统功率的过程中,由于自身初始荷电状态(SOC)不同而出现的过充过放问题以及传统下垂控制法不能实时合理分配储能系统负荷电流的不足,为此研究开发一种新的基于蓄电池SOC幂指数的下垂控制方法。与传统方法的不同在于该方法能够根据SOC幂指数的变化实时改变下垂系数,使蓄电池SOC和负荷电流达到均衡状态。通过对SOC控制特性进行分析选出SOC幂指数控制算法的合理参数n=2、p=7。蓄电池充、放电以及负载波动时的自动充放电过程Matlab/Simulink仿真计算结果显示,所提方法能够有效均衡2组蓄电池的负荷电流与SOC,且电压波动幅度控制在允许范围内。
Multiple energy storage units in DC microgrid may encounter some problems during the progress of supplementing or absorbing the power of a system,such as the overcharging and over-discharging problems due to their different initial state of charge(SOC),and the traditional droop control method cannot reasonably allocate load current of the energy storage system in real-time.A new droop control method based on the battery SOC exponent is developed in response to the above problems.The difference from the traditional method is that the new method can change the droop coefficient in real-time according to the change of the SOC exponent so that the battery SOC and the load current reach an equilibrium state.In the paper,the SOC control characteristics are analyzed,and then the reasonable parameters n=2 and p=7 of the SOC exponent control algorithm are selected.The The automatic charging and discharging process under battery charging,discharging,and load fluctuations is simulated on Matlab.It is shown that the proposed method can effectively balance the load current and SOC of the two battery groups.In addition,the voltage fluctuation amplitude is controlled within the allowable range.
作者
李冰
李岚
王浩
柴伦
LI Bing;LI Lan;WANG Hao;CHAI Lun(College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《电力科学与技术学报》
CAS
北大核心
2022年第1期48-54,共7页
Journal of Electric Power Science And Technology
基金
山西省应用基础研究项目(201701D121130)。
关键词
直流微电网
分布式储能
负荷分配
SOC均衡
下垂控制
DC microgrid
distributed energy storage
load distribution
SOC balance
droop control
